Query on Dual

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Can anyone tell me the performance issues related to the excessive usage of the
DUAL table in pl/sql procedures?
I remember reading
an article about this ( I dont remember if it was in ASKTOM site ) wherein it
was told that excessive usage of DUAL comes with a cost and there was a
suggestion in that to create a view on the system table
X$DUAL..
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If anybody has a
link to that please send it to me.
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Thanks to one and
all.
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Regards
Kesh

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